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Title (Primary) Light acclimatisation of Elodea nuttallii grown under ambient DIC conditions
Author Angelstein, S.; Schubert, H.;
Journal Plant Ecology
Year 2009
Department SEEFO;
Volume 202
Issue 1
Language englisch;
Keywords Elodea nuttallii; DIC; Photosynthesis; Pigmentation; Growth; Competition on light
Abstract Light acclimatisation capabilities of Elodea nuttallii at nearly ambient DIC conditions were investigated by determining growth characteristics, main photosynthetic parameters and pigmentation of plants incubated at 5 different irradiances (10-146 µmol photons m-2 s-1). Positive net growth was observed under all light treatments tested. Maximum ratio root versus shoot (r:s) of 1.86 was achieved at medium irradiances (72-94 µmol photons m-2 s-1), whereas at low (10 µmol photons m-2 s-1) and high irradiances (146 µmol photons m-2 s-1) r:s was significantly lower (0.39 and 1.05, respectively). With respect to main photosynthetic parameters, an increase of light compensation points (E c), attended by decreasing ratios of light saturation points of photosynthesis (E k)/irradiance were observed. E c values were comparable to other low-light adapted macrophytes, which indicate that E. nuttallii can be regarded as a low-light adapted plant, under photorespiratory conditions. This was also confirmed by maximum E k values of just 73 µmol photons m-2 s-1. Further support was achieved from pigmentation and non-photochemical quenching (NPQ) data, both indicating rather limited acclimatisation ability at light treatments above 90 µmol photons m-2 s-1. These results are discussed with respect to the competitive abilities of E. nuttallii under nearly ambient (photorespiratory) DIC conditions, especially in dense stands and turbid phytoplankton-dominated waters.
ID 15
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Angelstein, S., Schubert, H. (2009):
Light acclimatisation of Elodea nuttallii grown under ambient DIC conditions
Plant Ecol. 202 (1), 91 - 101